Tested on 2013-03-08 on nightly built from http://hg.mozilla.org/mozilla-central/rev/cb432984d5ce This morning I crashed after launching my Firefox Metro browser. I remember: 1. Toggling the "remember passwords" preference from On to Off. 2. Closing the browser with the gesture. 3. Reopening (almost right away). I think I have crashed three times today in a similar way: https://crash-stats.mozilla.com/report/index/bp-8f555406-725b-4cbe-b12f-19dc72130308
It looks like bug 844354 / bug 560890.
Mass close of bugs in obsolete product https://bugzilla.mozilla.org/show_bug.cgi?id=1350354